Power shovel



April 13, 1937. c, STQLTZ 2,077,159

POWER SHOVEL Filed April 20, 1955 Sheets-Sheet l ZUlZ72e55: [HZ/672757- dfirney C. E. STOLTZ POWER SHOVEL April 13, 1937.

Filed April 20, 1935 5 Sheets-Sheet 2 C. E. STOLTZ POWER SHOVEL April 13, 1937.

Filed April 20, 1935 '5 Sheets-Sheet 4 K111277655; M4 2 &

April 13, 1937. Q STOLTZ 2,077,159

POWER SHOVEL Filed April 20, 1935 5 Sheets-Sheet 5 O T War/ 555227} Patented Apr. 13, 1937 UNITED STATES PATENT OFFICE Mancha Storage Battery Chicago, 111., Application April 20,

19 Claims.

This invention relates to improvements in power shovels of the mucking type adapted to shovel muck or other materials in mines underground and discharge it into a car or like receptacle disposed rearwardly thereof.

Among the objects of my invention are to provide a new and improved mucker of a size which will readily fit in a mine cage, arranged with a view towards compactness and efiiciency in operation. Another object of my invention is to provide a new and improved operating mechanism for the scoop or shovel including a novel controlling means for moving the shovel longitudinally of the machine intothe material to be loaded during the initial shoveling operation, together with a new and improved means for controlling movement of the shovel to a discharge point rearwardly of its supporting truck and returning it to its initial gathering or loading position.

My invention may be more clearly understood with reference to the accompanying drawings, wherein:

' Figure 1 is a side elevation of a. shoveling ma- 5 chine illustrating one form in which my invention may be embodied, with certain parts broken away and shown in longitudinal section;

Figure 2 is a top plan view of the embodiment of my invention shown in Figure 1;

Figure 3 is a transverse sectional view taken substantially along line 33 of Figure 1;

Figure 4 is a sectional view taken substantially along line 4-4 of Figure 1;

Figure 5 is a fragmentary top plan view of the positioned differently than in Figure 1, and with the shovel and supporting beams therefor broken away and shown in section to clearly show one form of mechanism for aligning the scoop while discharging material therefrom;

Figure 6 is a fragmentary plan view similar to Figure 5, with certain other parts broken away and in section, and the shovel frame in a diflerent position than in Figure 5;

Figure 7 is an enlarged sectional view taken substantially along line 'l-l of Figure 5;

Figure 8 is a fragmentary plan ,view similar to Figure 5, but showinga modified form of mechanism for aligning the shovel frame and scoop while discharging material therefrom;

Figure 9 is a fragmentary plan view similar to Figure 8, showing the shovel frame in a diiferent position than in Figure 8;

Figure 10 is a sectional view taken substantially along line Ill-i0 of Figure 8;

device shown in Figure 1, with the shovel frame Locomotive Company,

a corporation oi. Illinois 1935, Serial No. 17,419

Figure 11 is a sectional view taken substantially along line of Figure 9;

Figures 12, 13, 14 and 15 are diagrammatical views of the embodiment of my invention illustrated in Figure 1, showing various stages of the operating cycle thereof; and

Figure 16 is a diagrammatical view showing the shovel arranged to be loaded onto a mine cage. 1

In the drawings the embodiment of my invention illustrated includes a truck III which comprises a frame mounted on track wheels l2, l2 and axles 3, 3 in a suitable manner. A tumtable or shovel frame I4 is supported on said truck frame for movement with respect thereto 15 about a vertical axis disposed adjacent the center of said truck frame.

The turntable includes a bottom plate l5 pivotally mounted on a boss l6 formed integral with and extending upwardly from the truck frame. Balls I1, I! carried in an annular guideway i8 having an outer diameter equal substantially to the outer boundaries of the truck frame form an anti-friction support for said turntable (see Figure 3). 5

A scoop 20 is pivotally supported adjacent its upper or discharge end on a transverse shaft 23 which is mounted adjacent its ends on the free ends of a pair of parallel-spaced beams 2|, 2|. Said shaft is connected to a bracket 24 secured to and extending rearwardly from said scoop and abutting the inner sides of said beams and is held from lateral movement with respect to said beams by means of pins 25, 25. The opposite ends of said beams are secured to a transverse shaft 21 which, as herein shown, is journaled at its ends in the hubs of a pair of parallel-spaced vertically arranged aligned gear sectors 29, 29 extending upwardly from the frame l4. Said gear sectors are secured to opposite sides of the frame I4 and are so arranged that a line extending through the center of their hubs intersects the boss Hi.

The scoop 20 is adapted to depend downwardly from the beams 2|, 2| during the initial gathering operation, as is best shown in Figure 1. Said scoop is provided with a digging edge 30 having spaced-apart digging teeth 3|, 3| projecting forwardly therefrom so that said digging edge and teeth may engage and slide along the ground for picking up loose material therefrom.

' The beams' 2|, 2| are simultaneously swung about the axis of the shaft 21 for elevating said scoop and positioning it for discharging material into a suitable car 32 or like receptacle disposed rearwardly of the truck by means of gears 33, 33 keyed to opposite ends of a transverse shaft 34. Said shaft is journaled in said beams intermediate the ends thereof and said gears 5 mesh with the teeth of the gear sectors 29, 29.

A motor 35 is secured to the turntable or shovel frame |4 adjacent the rearward end thereof between the gear sectors 29, 29 for driving the gears 33, 33. Said motor may be of any type,

but is herein preferably shown as being an air motor of a standard construction, well known to those skilled in the art. Said motor is provided with a transversely extending motor shaft 36 having a sprocket 31 keyed thereon. A

sprocket 39 is freely mounted on the transverse shaft 21 between one beam 2| and one gear sector 29 and is driven from the sprocket 31 by means of a drive chain 40. Another sprocket 4| is freely mounted on the transverse shaft 21 adjacent the sprocket 39 and is herein shown as being formed integral therewith and driven thereby. Said sprocket has driving connection with the transverse shaft 34 by means of a chain and sprocket drive, generally indicated by reference character 43. It will thus be apparent that when the motor 35 is driven in one direction, the spur gears 33, 33 will rotate along the gear sectors 29, 29 and simultaneously pivot the beams 2|, 2| about the axis of the transverse shaft 21.

Suitable means (not shown) may be provided to stop the motor and movement of the beams 2|, 2| when they reach the extreme ends of their path of travel in either direction. If desired,

35 said means may also act as a means for reversing the direction of rotation of the motor 35. Said means forms no part of my present invention so is not herein shown or described in detail.

Referring now. in particular to the novel means for controlling movement of the scoop during the gathering and loading operations and moving saidscoop longitudinally forwardly into the material during the initial gathering operation, said means, as herein shown, includes a controlling link 44. Said link is pivoted adjacent one of its -'ends to a transverse shaft carried in suitable brackets 46, 46 extending rearwardly from said scoop adjacent opposite sides thereof. Said brackets are spaced downwardly from the bracket 24 a substantial distance, when said scoop is positioned as in Figure 1. Said controlling link is slotted for a portion of its length and the slotted portion thereof slidably engages a roller 41 on the transverse shaft 34. The end of said link opposite the scoop 20 is provided with a notch 49 communicating with the slotted portion of said link and offset rearwardiy and downwardly therefrom when in the position shown in Figure 1.

A guiding member 50 is provided adjacent the forward end of the shovel frame H for engaging the lower rearward surface of the controlling link 44. Said guiding member may be of any construction, but is herein shown as being a flanged anti-friction roller mounted on a horizontal shaft 5|. Said shaft is mounted in an adjustable bracket 52 which, as herein shown, is of a bifurcated formation having its prongs extending towards the forward end of the machine and hav- 0 ing saidshaft mounted between said prongs. The under surfaces of the prongs of said bracket are beveled downwardly towards the rearward end of the frame and the beveled surfaces thereof engage beveled wedges 53, 59 secured to the forward end of the turntable l4 and extending upwardly and forwardly therefrom.

A lug 3|fextends angularly upwardly from the central portion of the bracket 52 and has a threaded shaft 62 secured thereto and extending angularly downwardly and rearwardly therefrom in a plane parallel to the angle of the wedges 58. The opposite end of said shaft is slidably mounted in a lug 63 on the turntable l4. A hand wheel 64 is threaded on said shaft between the lugs 6| and 63 and abuts the lug 63. Thus, rotation of said hand wheel in one direction will elevate and move the roller 59 forwardly along the turntable l4 and elevate the forward end of said scoop to compensate for increased distances between the top of the rail to the ground; and rotation of said hand wheel in an opposite direction will lower the forward end of said scoop.

It should be observed that when the beams 2 2| are moving in a forward direction from a position similar to that illustrated in Figure 1, to a position such as is illustrated in Figure 12, and the guiding member 59 engages the rearward face of the controlling link 44, that the reaction of said guiding member against said controlling link pivots the shovel or scoop 20 in a forward direction about its axis of pivotal connection to the beams 2 2| and thus moves the forward end of said scoop longitudinally forwardly of the truck along the ground. As said link reaches the end of its longitudinal travel with respect to said beams, said guiding member engages the roller 41 with the notch 49 and locks said controlling link from slidable movement with respect to said beams, as is diagrammatically illustrated in Figure 12. At this point the limit of downward travel of the beams 2| 2| is reached and reverse movement of the gears 33, 33 will elevate said beams and swing the forward end of the scoop 29 in an upward direction until a position is reached, such as is indicated in Figure 13.

Means are provided for guiding and controlling movement of the scoop 20 from a position such as is shown in Figure 13, to the discharge position illustrated by dotted lines in Figure 1, which means, as herein shown, comprises a pair of guide cams 53, 53. Said guide cams are secured to the inner sides of opposite side plates 54, 54 which extend upwardly from and are secured to opposite sides of the frame |4 adjacent the outer sides of the gear sectors 29, 29. Each of said guide cams is provided with a depending relatively blunt rounded forward end spaced forwardly of and above the forward end of the frame l4. From said forward end, said cams are inclined upwardly at a gradual inclination to a point disposed rearwardly of the center of said frame, from which point the angle of inclination of said cams increases to guide the forward or engaging end of the scoop in an upward direction.

Suitable rollers 55., 55 are mounted on the outer ends of the transverse shaft 45 and are adapted to engage and support said scoop for movement along said guide cams. Thus, upon upward movement of the beams 2|, 2| said guide cams will be engaged by said rollers and will elevate and move the forward end of the scoop 20 forwardly a distance suiiicient to disengage the transverseshaft 34 from the notch 49, and support the forward portion of said scoop in a relatively retracted loaded position, during movement toward the rearward or discharge end of the frame M, as is illustrated in Figure 14.

Stops 56., 56 are provided on the inner sides of the side plates 54, 54 in alignment with, but

spaced upwardly from'upturned rearward ends of the guide earns 53, 53 for ensuing the rollers 55, 55. Said stops thus limit upward pivotal movement of said scoop and hold it in the discharge position, illustrated by dotted lines in Figure l.

Each stop 55, as herein shown, has a concave engaging surface conforming to the circumference of the roller 55 and is yieldably mounted in a bracket 51 secured to the side plate 54 so as to be slidably movable with respect thereto against compression springs 58a, 55a (see Figure 4).

Guide cams 59, 59 are provided rearwardly of and extend downwardly beneath the guide cams 53, 53 toward the forward end of the side plates 54, 54. Said guide cams each have an upturned upper end 50 in alignment with the stops 55 and are adapted to engage the rollers 55 and support and guide the scoop 20 to an initial gathering position, upon movement of the beams 2|, 2| in a clockwise direction, in the manner illustrated in Figure 15.

It will thus be apparent that upon movement of the beams 2|, 2| in a clockwise direction from a position shown in Figures 12 and 15, that the scoop will first be lowered to a. position adjacent the ground, and as it approaches the ground it will be moved longitudinally of the truck into the material to be gathered by the controlling link 44 which engages the guiding member 55, as is best illustrated in Figures 1 and 12.

Upon reverse or counter-clockwise movement of said beams, the forward end of the scoop 20 is pivoted in an upward direction about its axis of pivotal connection tothe beams 2|, 2| until the rollers 55, 55 engage the forward ends of the guide cams 53, 53 when the notch 49 is disengaged from the transverse shaft 34. The rearward portion of said scoop is supported on said guide cams while being moved rearwardly along the frame l4 until it reaches the rearward end of said guide cams when its forward end is pivoted upwardly about its axis of pivotal connection to the beams 2|, 2| and the rollers 55, 55 are engaged with the spring-pressed stops 55, 55 from which position material is discharged therefrom into the car 32. Upon reverse movement of said beams, the rollers 55, 55 engage the guide earns 59, 59 and support the forward end of said scoop for downward movement along said guide cams, as is shown in Figure 14, until it reaches the initial loading position, shown in Figures 1 and 11.

The turntable or shovel frame ll may be turned in any suitable manner for'positlonlng the scoop for gathering material from opposite sides of the track, but for the purpose of simplicity, said turntable is herein preferably shown as being manually turned.

A centering mechanism of a novel construction is provided for aligning said turntable with the truck frame when the scoop is in a discharge 65 position, so that material may be discharged from the same point from the rear of the truck regardless of the position of the turntable with respect to the truck during the gathering operation. Said means, as shown in detail in Fig- 70 ures 2, 3, 6 and 7, includes a depending lever arm 55 keyed to the transverse shaft 21. The lower portion of said lever arm tapers to a longitudinally extending wedge-shaped point. Said lower tapered sides of said lever arm are adapted 7 to engage the sides of a stationary cam 55 shaped the beveled surfaces of said cam members.

substantially in the form of a Y and open towards the rearward end of the frame.

Said cam, as herein shown, is formed from an upstanding portion of the boss l5 and is so arranged that when the scoop 20 is in a lowered 5 position the turntable I4 is free to turn a predetermined amount to permit the scoop to be positioned to either side of the track. When said turntable is positioned, as shown by either dotted or solid lines in Figure 5, one of the wedge-shaped 10 sides of the lever arm 55 will engage a slot formed from the stem of the Y and upon pivotal movement of the shaft 21 in a counter-clockwise direction will swing said turntable to a position in alignment with the frame II, as is illustrated in 15 Figures 5 and 6. It should be noted that when the scoop is in a discharge position, said engaging member is engaged with the stem of the Y- shaped cam 55 and the frames II and M are locked in fixed relation with respect to each 20 other, but that when the beams 2|, 2| are in a forward lower position, said engaging member is disengaged from said slot to permit pivotal movement of the frame I with respect to the frame II to either side of the center line thereof. 25

Referring now particularly to the modified form of device for aligning the frames II and I4, illustrated in Figures 8 to 11, inclusive, the boss I5 is shown as being of less vertical dimensions than in Figure l, and has a plate 59 secured to its top 30 surface. A fixed cam member 10 extends upwardly from said plate and has opposite spacedapart vertical beveled surfaces 1|, 1| extending angularly inwardly toward the rearward end of the frame. Parallel-spaced engaging mem- 35 bers 12, 12 are keyed to the transverse shaft 21 inwardly of 'the beams 2|, 2| for engagement with Said engaging members depend from the shaft 21 and are herein shown as beingformed in the shape 40 of a segment of a circle. Each of said engaging members has a forward radial side 12a, and an inner beveled arcuate edge 13. When the frame I4 is positioned in an extreme position to one side of the frame II as in Figure 8, the radial side 45 12a of said engaging member will engage the beveled face 1| of the cam member 10 (see Figure l0) As said engaging member pivots about the axis of the shaft 21, it will simultaneously pivot the frame l4 and align said frame with 50 respect to the truck. When in such a position the beveled surface 13 will engage the beveled surface of said cam member and both of said engaging members will act as a stop to prevent movement of the turntable l4 beyond an aligned position 55 in either direction.

It will thus be apparent that the device of my invention is so arranged that the scoop is automatically positioned so as to extend longitudinally of the frame when it is positioned for dis- 6O charging material into a mine car. It may also be seen that said aligning means isof a simplified construction which effects movement of the swinging frame H in a simple and eillcient manner with a minimum amount of moving parts.

A suitable means is provided for propelling the machine along the rails and moving the scoop ,into engagement with the material it is desired to load. Said means, as herein shown, comprises a motor 14 which may be of any type, but which is herein preferably shown as being an air motor similar to the motor 35. Said motor is provided with a motor sprocket 15 which has drive connection with the forward truck axle by means of a chain and sprocket drive, generally indicated 76 by reference character 18. The forward and rearward truck axles i3, II are operatively connected together by means of a chain and sprocket place to working place, and when it is desired toplace the machine in the mine cage for moving it from one level to another in the mine. Said means, as herein shown, comprises a plurality of aligned apertures 19, 19 formed in the side plates is within the forward boundaries of the side plates 54, 54, and the rearward boundaries of the truck l and utilizes a minimum amount of longitudinal space, which permits the entire device to be moved in the average mine cage.

While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction and arrangement of the various parts may be changed or altered without departing from the spirit or scope thereof. Furthermore, I do not wish to be construed as limiting myself to the precise construction illustrated, excepting as it may be limited in the appended claims.

I claim as my invention:

1. In a power shovel, the combination of frame, a beam horizontally pivoted on said frame, a scoop pivoted on said beam, means for swinging said beam about a horizontal axis, and means for controlling movement of said scoop upon swinging movement of said beam and moving the forward end of said scoop longitudinally forwardly of said frame and thence upwardly to a discharge point rearwardly of said frame including a controlling member extending rearwardly from said scoop at a point spaced downwardly from the axis of pivotal connection of said beam thereto when said scoop is in a loading position, and adapted to be actuated by engagement with said frame for moving said scoop forwardly of said frame during the last part of the downward and initial upward movement of said beam, and a supporting guide on said frame extending longi tudinally therealong adapted to have supporting engagement with said scoop for guiding and sup porting said scoop in a loaded condition to a discharge position beyond the rearward end of said frame.

2. In a power shovel, the combination of a frame, a beam horizontally pivoted on said frame. a scoop pivoted on said beam, means for swinging said beam about a horizontal axis, and means for controlling movement of said scoop upon swinging movement of said beam and moving the forward end of said scoop longitudinally forwardly of said frame and thence upwardly to a discharge point rearwardly of said frame including a controlling member extending rearwardly from said scoop at a point spaced downwardly from the axis of pivotal connection of said beam thereto when said scoop is in a loading position, and adapted to be actuated by engagement with said frame upon movement of said beam, for moving said scoop forwardly of said frame during the last part of the. downward and initial upward movement of said scoop, a supporting guide on said frame extending longitudinally therealong adapted to have supporting engagement with said scoop for guiding and supporting said scoop in a loaded condition to a point disposed adjacent the rearward end of said frame, and pivot said scoop about its axis of pivotal connection to said beam to an extended relatively upright discharge position adjacent the rearward end thereof, and another guide beneath said first guide for guiding said scoop to an initial loading position.

3. In a power shovel, the combination of a frame, a beam pivoted to said, frame adjacent one of its ends for movement with respect thereto about a horizontal axis, a scoop pivotally supported by said beam in such a manner as to overhang said frame when said beam is in a lowered position so that a forwardly disposed digging lip may be adjacent the ground, means for swinging said beam about its axisof pivotal connection to said frame, and means for controlling movement of said scoop upon swinging movement of said beam for moving the forward end of said scoop longitudinally forwardly along the ground as said beam approaches the forward end of said frame and continuing said forward movement of said scoop, and simultaneously pivoting said scoop in an upward direction and elevating said scoop upon pivotal movement of said beam in a rearward direction comprising a controlling member extending from said scoop at a point spaced downwardly from said beam when said scoop is in a loading position, and a member on said frame adapted to engage said controlling member and cause said scoop to be moved in a forward and upward direction upon engagement with said controlling member.

4. In a power shove], the combination of a frame, a beam pivoted to said frame adjacent one of its ends for movement with respect thereto about a horizontal axis, a scoop pivotally supported by said beam in such a manner as to overhang said frame when said beam is in a lowered position so that a forwardly disposed digging lip may be adjacent the ground, means for swinging said beam about its axis of pivotal connection to said frame, and means for controlling movement of said scoop upon swinging movement of said beam for moving the forward end of said scoop longitudinally forwardly along the ground as said beam approaches the forward end of said frame and continuing said forward movement of said scoop, and simultaneously pivoting said scoop in an upward direction and elevating said scoop upon pivotal movement of said beam in a rearward direction comprising a controlling member extending from said scoop at a. point spaced downwardly from said beam when said scoop is in a loading position, a member on the forward end of said frame adapted to engage said controlling member and cause said scoop to be moved in a forward and upward direction upon engagement with said controlling member, and a guide on said frame extending longitudinally therealong adapted to be engaged by said scoop for supporting said scoop in a retracted loaded position with respect to said frame, and extending said scoop to a relatively upright discharge position at the discharge end of said frame.

5. In a power shovel, the combination of a frame, a beam horizontally pivoted on said frame, a scoop pivoted on said beam, means for swinging said beam, and means for controlling movement of said scoop upon swinging movement of said beam and moving the forward end of said scoop longitudinally forwardly of said frame and 5 thence upwardly to a discharge point rearwardly of said frame including a controlling link pivoted to said scoop at a point spaced from the axis of pivotal connection of said beam thereto, said link having slidable engagement with said beam, and means on said frame adapted to engage said controlling link and control movement of said scoop upon downward swinging movement of said beam and lock said controlling link from translational movement with respect to said beam during the initial upward swinging movement thereof.

6. A power shovel in accordance with claim 5, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop which communicates 0 with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot, and wherein downward movement of said beam to an extreme lowermost position acts to engage said member with said notch for locking said link from slidable movement with respect to said beam during initial upward movement thereof.

7. A power shovel in accordance with claim 5, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop which communicates with said slot, wherein said slot is slidably engaged by a guiding member on said beam, and wherein a member is provided on the forward end of said frame which is adapted to be engaged by said controlling link for controlling movement thereof and engaging said guiding member with said notch when said beam is in an extreme lowermost position, for locking said link from slidable movement with respect to said beam during initial upward movement thereof. 8. A power shovel in accordance with claim 5, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop which communicates with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot, wherein downward movement of said beam to an extreme lowermost position acts to engage said member with said notch for locking said link from slidable movement with respect to said beam during initial upward movement thereof, and wherein a guide is provided on said frame whichis adapted to be engaged by said scoop for releasing said notch from said guiding member and guiding said scoop in a loaded position during rearward movement thereof along said frame to a discharge position.

9. A power shovel in accordance with claim 5, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop communicating with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot, wherein downward movement of said beam to an extreme lowermost position acts to engage said member with said notch for locking said link from slidable movement with respect to said beam during initial upward movement of said scoop, wherein a guide is provided on said frame which is adapted to be engaged by said scoop for releasing said notch from said guiding member and guiding said scoop in a loaded position during rearward movement thereof along said frame to a discharge position, and wherein said guide is 7 5 adapted to pivot said scoop about its axis of pivotal connection to said beam to an extended relatively upright discharge position with respect to said frame adjacent the rearward end thereof.

10. A power shovel in accordance with claim 5, wherein the controlling link is slotted for a por- 5 tion of its length and is provided with a notch at its end opposite said scoop communicating with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot, wherein downward movement of said beam to an 10 extreme lowermost position acts to engage said member with said notch for locking said link from slidable movement with respect to said beam during initial upward movement thereof, wherein a guide is provided on said frame which is 5 adapted to be engaged by said scoop for releasing said notch from said guiding member and guiding said scoop in a loaded position during rearward movement thereof along saidframe to a discharge position, wherein said guide is adapt- 20 ed to pivot said scoop about its axis of pivotal connection to said beam to an extended relatively upright discharge position with respect to said frame adjacent the rearward end thereof, and wherein another guide is provided on said frame 25 beneath said first guide for guiding said scoop to an initial loading position.

11. In a power shovel, the combination of a frame, a beam horizontally pivoted on said frame,

a scoop pivoted on said beam, means for swing- 30 ing said beam about a horizontal axis, and means for controlling movement of said scoop upon swinging movement of said beam and moving the forward end of said scoop longitudinally forwardly of said frame and thence upwardly to a 35 discharge point rearwardly of said frame including a controlling link pivoted to said scoop at a point spaced from the axis of pivotal connection of said beam thereto, said link being slotted for a portion of its length and being pro- 40 vided with a notch at its end opposite said scoop communicating with said slot, a guiding member on said beam having slidable engagement with said slot whereby downward movement of said beam to an extreme lowermost position acts to 45 engage said guiding member with said notch for locking said link from slidable movement with respect to said beam during initial upward movement of said scoop, a guide on said frame adapted to be engaged by said scoop for releasing said 50 notch from said guiding member and guiding said scoop in a loaded position during rearward movement thereof along said frame to a discharge position, and adapted to pivot said scoop about its axis of pivotal connection to said beam 55 to an extended relatively upright discharge position adjacent the rearward end thereof.

12. In a power shovel, the combination of a frame, a beam horizontally pivoted on said frame,

a scoop pivoted on said beam, means for swinging said beam about a horizontal axis, and means for controlling movement of said scoop upon swinging movement of said beam and moving the forward end of said scoop longitudinally forwardly of said frame and thence upwardly to a dis- 5 charge point rearwardly of said frame including a controlling link pivoted to said scoop at a point spaced from the axis of pivotal connection of said beam thereto, said link being slotted for a portion of its length and being provided with a notch 70 at its end opposite said scoop communicating with said slot, a guiding member on said beam having slidable engagement with said slot whereby downward movement of said beam to an extreme lowermost position acts to engage said guiding member with said notch for'locking said link from slidable movement with respect to said beam during initial upward movement of said scoop, a guide on said frame adapted to be engaged by said scoop for releasing said notch from said guiding member and guiding said scoop in a loaded position during rearward movement thereof along said frame to a discharge position, and adapted to pivot said scoop about its axis of pivotal connection to said beam to an extended relatively upright discharge position adjacent the rearward end thereof, and another guide on said frame beneath said first guide for guiding said scoop to an initial loading position.

13. In a power shovel, the combination of a frame, a beam pivoted to said frame adjacent one of its ends for movement with respect thereto about a horizontal axis, a scoop pivoted at its upper end to the free end of said beam in such a manner as to overhang said frame so that a forwardly disposed digging lip on said scoop may be disposed adjacent the ground when said beam extends forwardly of said frame in lowered position with respect thereto, means for swinging said beam about its axis of pivotal connection to said frame, and means for controlling movement of said scoop upon swinging movement of said beam for moving the forward end of said scoop longitudinally forwardly along the ground as said beam approaches the forward end of said frame and continuing said forward movement of said scoop, and simultaneously pivoting said scoop in an upward direction about its axis of pivotal connection to said beam and elevating said scoop upon pivotal movement of said beam in a rearwarddirection comprising a controlling link pivotally connected to said scoop at a point spaced downwardly from the axis of pivotal connection of said beam to said scoop when said scoop is in a loading position and having slidable connection with said beam and adapted to be locked from slidable movement with respect to said beam when said scoop is in a lowermost position with respect to said frame and during the initial upward movement thereof, and means on said frame for engaging said controlling link and controlling movement thereof.

14. A power shovel in accordance with claim 13, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop communicating with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot and wherein said means on said frame engaging said controlling link acts to move the scoop forwardly into the material upon downward movement of said beam and engage said slot with said guiding member upon the completion of downward movement of said beam for pivoting the forward end of said scoop upwardly upon upward movement of said beam.

15. A power shovel in accordance with claim 13, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop communicating with said slot, wherein a guiding member is provided on said .beam for slidably engaging said slot and wherein said means on said frame engaging said controlling link acts to move the scoop forwardly into the material upon downward movement of said beam and engage said slot with said guiding member upon the completion of downward movement of said beam, for pivoting the forward end of said scoop upwardly upon upward movementof said beam, and wherein a guide is provided which is adapted to be engaged by means on said scoop disposed adjacent the axis of pivotal connection of said link thereto for disengaging said notch from said guiding member and supporting said scoop in a retracted loaded position with respect to said beam during movement towards a discharge position, and extending said scoop to a relatively upright discfiharge position at the discharge end of said rame.

16. A power shovel in accordance with claim 13 wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop communicating with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot and wherein said means on said frame engaging said controlling link acts to move the scoop forwardly into the material upon downward movement of said beam and engage said slot with said guiding member upon the completion of downward movement of said beam for pivoting the forward end of said scoop upwardly upon upward movement of said beam, wherein'a guide is provided which is adapted to be engaged by means on said scoop disposed adjacent the axis of pivotal connection of said link thereto for disengaging said notch from said guiding member and supporting said scoop in a retracted loaded position with respect to said beam during movement towards a discharge position and extending said scoop to a relatively upright discharge position at the discharge end of said frame, and

wherein another guide is spaced rearwardly from said first-mentioned guide for engaging said means on said.scoop and guiding said scoop to an initial loading position.

17. A power shovel in accordance with claim 13, wherein the controlling link is slotted for a portion of its length and is provided with a notch at its end opposite said scoop communicating with said slot, wherein a guiding member is provided on said beam for slidably engaging said slot and wherein said means on said frame engaging said controlling link acts to move the scoop forwardly into the material upon downward movement of said beam and engage said slot with said guiding member upon the completion of downward movement of said beam for pivoting the forward end of said scoop upwardly upon upward movement of said beam, wherein a guide is provided which'is adapted to be engaged by means on said scoop disposed adjacent the axis of pivotal connection of said link thereto for disengaging said notch from said guiding member and supporting said scoop in a retracted loaded position with respect to said beam during movement towards a discharge position and pivoting said scoop about its axis of pivotal connection to said beam to a discharge position, wherein a stop is adapted to engage said scoop at the completion of its upward path of travel, and wherein another guide is spaced rearwardly of and extends beneath said first-mentioned guide for guiding said scoop to an initial loading position.

18. In a power shovel, the combination with a frame, a beam horizontally pivoted on said frame having a scoop pivoted to the free end thereof, means on said frame for elevating said beam and scoop for discharging material rearwardly of said frame comprising a gear segment on said frame, a gear on said beam meshing with said gear segment, and power means for driving said gear, and means for controlling movement of said scoop and moving said scoop longitudinally forwardly along the ground during the initial gathering operation comprising a slotted controlling link pivoted to said scoop at a point spaced downwardly from the axis of pivotal connection of said beam thereto, when said scoop is in an initial gathering position, and having slidable engagement with said beam in said slot, said slot leading to a notch at the end of said controlling link opposite the point of connection of said link to said scoop, and a member on said frame adapted to engage the rearward face of said link for initially swinging said scoop longitudinally forwardly of said frame and locking said beam in said notch during the initial upward movement of said beam and swinging the forward end of said scoop upwardly in a loaded position.

19. In a power shovel, the combination with a frame, a beam horizontally pivoted on said frame having a scoop pivoted to the free end thereof, means on said frame for elevating said beam and scoop for discharging material rearwardly of said frame comprising a gear segment on said frame, a gear on said beam meshing with said gear segment, and power means for driving said gear, and means fdr controlling movement of said scoop and moving said scoop longitudinally forwardly along the ground during the initial gathering operation comprising a slotted controlling link pivoted to said scoop at a point spaced downwardly from the axis of pivotal connection of said beam thereto, when said scoop is in an initial gathering position, and having slidable engagement with said beam in said slot, said slot leading to a notch at the end of said controlling link opposite the point of connection of said link to said scoop, and a member on said frame adapted to engage the rearward face of said link for initially swinging said scoop longitudinally forwardly of said frame and locking said beam in said notch during the initial upward movement of said beam and swinging the forward end of said scoop upwardly in a loaded position, and means for disengaging said notch from said beam during rearward movement of said scoop along said frame comprising a guide member supporting the rearward end of said scoop.

CHARLES E. STOLTZ. 

